Love is presented as the subject or doer of actions in the poem. Why do you think the poet has used this form rather than involving human agents?

The poet has personified Love as the subject and doers of action in the poem because the main theme is love. His goal is to bring out the true definition of Love. He has employed the device of personification and metaphors to describe Love's true nature which goes far beyond human limitations and fickleness of the human heart. By choosing to present Love as the main subject he has also brought up the subject of human nature which serves as a sharp contrast to the constancy and permanence of Love.